Reapply "Port regexp tests from V8 to Dart."

tests/corelib/regexp/UC16_test.dart

Index: tests/corelib/regexp/UC16_test.dart
diff --git a/tests/corelib/regexp/UC16_test.dart b/tests/corelib/regexp/UC16_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c8a16deaa50c775ce4cd53ece31728ef379f4301
--- /dev/null
+++ b/tests/corelib/regexp/UC16_test.dart
@@ -0,0 +1,53 @@
+// Copyright (c) 2014, the Dart project authors. All rights reserved.
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import 'v8_regexp_utils.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  // UC16
+  // Characters used:
+  // "\u03a3\u03c2\u03c3\u039b\u03bb" - Sigma, final sigma, sigma, Lambda, lamda
+  shouldBe(new RegExp(r"x(.)\1x", caseSensitive: false).firstMatch("x\u03a3\u03c3x"),
+      ["x\u03a3\u03c3x", "\u03a3"], "backref-UC16");
+  assertFalse(new RegExp(r"x(...)\1", caseSensitive: false).hasMatch("x\u03a3\u03c2\u03c3\u03c2\u03c3"),
+              "\1 ASCII, string short");
+  assertTrue(new RegExp(r"\u03a3((?:))\1\1x", caseSensitive: false).hasMatch("\u03c2x"), "backref-UC16-empty");
+  assertTrue(new RegExp(r"x(?:...|(...))\1x", caseSensitive: false).hasMatch("x\u03a3\u03c2\u03c3x"),
+            "backref-UC16-uncaptured");
+  assertTrue(new RegExp(r"x(?:...|(...))\1x", caseSensitive: false).hasMatch("x\u03c2\u03c3\u039b\u03a3\u03c2\u03bbx"),
+            "backref-UC16-backtrack");
+  var longUC16String = "x\u03a3\u03c2\u039b\u03c2\u03c3\u03bb\u03c3\u03a3\u03bb";
+  shouldBe(new RegExp(r"x(...)\1\1", caseSensitive: false).firstMatch(longUC16String),
+          [longUC16String, longUC16String.substring(1,4)],
+          "backref-UC16-twice");
+
+  assertFalse(new RegExp(r"\xc1", caseSensitive: false).hasMatch('fooA'), "quickcheck-uc16-pattern-ascii-subject");
+  assertFalse(new RegExp(r"[\xe9]").hasMatch('i'), "charclass-uc16-pattern-ascii-subject");
+  assertFalse(new RegExp(r"\u5e74|\u6708").hasMatch('t'), "alternation-uc16-pattern-ascii-subject");
+}